20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack grow media com/root-stimulants/myco-madness/

com/root-stimulants/myco-madness/

Steady supply of CO2 for 6 months guaranteed

Noise (dB) - =56dB

Natural & Organic Potting Mix is an all-purpose mix recommended for containers and raised beds and ensures good aeration

This thriving colony of Ulocladium oudemansii provides protection from pathogens to fruit

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack grow media com/root-stimulants/myco-madness/Important Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,